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Zagorodnov, I.

 
Paper Title Page
WG314 Start-To-End Simulations for the European XFEL  
 
  • M. Dohlus, I. Zagorodnov
    DESY, Hamburg
 
  The lattice and optics data of the s2e simulations are based on an Excel table with the XFEL component list [1]. The simulation tools are ASTRA, CSRtrack, GENESIS and ELEGANT. Utility programms are used to convert particle files and to consider wake fields of cavities (calculated with ECHO) or due to space charge, surface effects and the undulator geometry. The simulations [2] for the XFEL STI review meeting (15/16 March 2006) are based on ASTRA calculations for the low energy part (including the first module) and on semianalytic estimations of space charge effects and particle propagation based on transport matrices for all non dispersive sections upstream of the undulator. Dispersive sections as the two bunch compressors are computed with the 1d model of CSRtrack. GENESIS is used for the SASE-FEL process in the undulator. The s2e simulation reported on the XFEL-s2e web page [3] uses ASTRA calculations for all non-dispersive parts of the XFEL before the second bunch compressor and even for the following eight rf modules. The injector dogleg as well as both bunch compressors are simulated with CSRtrack using a 3D sub-bunch approach. The rest of the machine before the undulator is treated with ELEGANT and semianalytic space charge wakes. SASE simulations are so far not available. There is a considerable difference in the numerical effort of the start-to-undulator simulations for [2] and [3]. The later simulation is intended as a reference solution. A method that is efficient and precise is probably based on the use of ELEGANT in combination with the semianalytic space charge estimation for parts of the XFEL even before the first bunch compressor and on the 1d CSR model in CSRtrack. This is subject of further investigations.

[1] http://www.desy.de/xfel-beam/data/component_list.xls

[2] TESLA-FEL Report 2005-10

[3] http://www.desy.de/xfel-beam/s2e/xfel_v4.html

 
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